Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.021; wR factor = 0.054; data-to-parameter ratio = 16.2.In the anion of the title compound, (C 7 H 11 N 2 )[CoCl 3 -(C 7 H 10 N 2 )], the Co II ion is coordinated by one N atom from a 4-(dimethylamino)pyridine (DMAP) ligand and three Cl atoms, forming a CoNCl 3 polyhedron with a distorted tetrahedral geometry. In the crystal, cations and anions are linked via weak N-HÁ Á ÁCl and C-HÁ Á ÁCl hydrogen bonds. Double layers of complex anions stack along the b-axis direction, which alternate with double layers of 4-(dimethylamino)-pyridinium cations.
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Data collectionBruker APEXII diffractometer 7932 measured reflections 3230 independent reflections 2982 reflections with I > 2(I) R int = 0.012